fix: add keywords

Author: qiwihui

_posts/2020-06-14-#7.md

@@ -2,6 +2,7 @@
 layout: post
 title: "Python 周报 #7 | 2020-06-14"
 permalink: /7
+keywords: BLM, Black Lives Matter, machine-learning, aysnc, await, collections, enum, gRPC
 ---
 
 Python 周报，提供有价值的 Python 及行业相关信息。